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UC3525ADWTR 芯片概述及应用研究一、概述 UC3525ADWTR 是一款广泛应用于电源管理和控制系统的集成电路。该芯片主要用于提供高效的开关电源解决方案，并在多种电子设备中发挥重要作用。UC3525ADWTR 集成了多项功能，使得设计者可以在其电子电路中实现高效的功率转换和控制。该芯片的工作原理基于脉宽调制（PWM）技术，其内部集成的控制电路能够自动调节输出电压和电流，从而确保电源系统的稳定性与高效性。此外，UC3525ADWTR 具有出色的电源管理能力，能够在不同负载条件下保持良好的工作性能。二、详细参数 UC3525ADWTR 的关键参数包括： 1. 工作电压范围：8V 到 35V 2. 输出频率：可调频率范围为 100kHz 至 500kHz 3. 开关电流：最大开关电流为 1A 4. 温度范围：工作温度为 -40℃ 至 +85℃ 5. 功耗：静态功耗较低，有利...

产品型号UC3525ADWTR的Datasheet PDF文件预览

UC1525A/27A

UC2525A/27A

UC3525A/27A

Regulating Pulse Width Modulators

FEATURES

DESCRIPTION

• 8 to 35V Operation

The UC1525A/1527A series of pulse width modulator integrated circuits are de-

signed to offer improved performance and lowered external parts count when

used in designing all types of switching power supplies. The on-chip +5.1V ref-

erence is trimmed to ±1% and the input common-mode range of the error ampli-

fier includes the reference voltage, eliminating external resistors. A sync input to

the oscillator allows multiple units to be slaved or a single unit to be synchro-

nized to an external system clock. A single resistor between the C_Tand the dis-

charge terminals provides a wide range of dead-time adjustment. These

devices also feature built-in soft-start circuitry with only an external timing ca-

pacitor required. A shutdown terminal controls both the soft-start circuitry and

the output stages, providing instantaneous turn off through the PWM latch with

pulsed shutdown, as well as soft-start recycle with longer shutdown commands.

These functions are also controlled by an undervoltage lockout which keeps the

outputs off and the soft-start capacitor discharged for sub-normal input volt-

ages. This lockout circuitry includes approximately 500mV of hysteresis for jit-

ter-free operation. Another feature of these PWM circuits is a latch following the

comparator. Once a PWM pulse has been terminated for any reason, the out-

puts will remain off for the duration of the period. The latch is reset with each

clock pulse. The output stages are totem-pole designs capable of sourcing or

sinking in excess of 200mA. The UC1525A output stage features NOR logic,

giving a LOW output for an OFF state. The UC1527A utilizes OR logic which

results in a HIGH output level when OFF.

• 5.1V Reference Trimmed to ±1%

• 100Hz to 500kHz Oscillator Range

• Separate Oscillator Sync Terminal

• Adjustable Deadtime Control

• Internal Soft-Start

• Pulse-by-Pulse Shutdown

• Input Undervoltage Lockout with

Hysteresis

• Latching PWM to Prevent Multiple

Pulses

• Dual Source/Sink Output Drivers

BLOCK DIAGRAM

OSC

OUT

VREF

NOR

UVLO

Lockout

Reference

Regulator

+VIN 15

OUTPUT A

GROUND 12

To internal

circuitry

SYNC

Flip

Flop

NOR

OSC

OUTPUT B

DISCHARGE

UC1525A Output Stage

COMP

COMPENSATION

INV INPUT

PWM

La tch

Error

Amp

V_REF

50 µA

OUTPUT A

NI INPUT

SOFTSTART

3 kΩ

SHUTDOWN 10

OUTPUT B

5 kΩ

UC1527A Output Stage

SLUS191B - February 1997 - Revised June 2005

UC1525A/27A

UC2525A/27A

UC3525A/27A

ABSOLUTE MAXIMUM RATINGS(Note 1)

RECOMMENDED OPERATING CONDITIONS

(Note 3)

Supply Voltage, (+V_IN). . . . . . . . . . . . . . . . . . . . . . . . . . . . +40V

Collector Supply Voltage (V_C) . . . . . . . . . . . . . . . . . . . . . . +40V

Logic Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to +5.5V

Analog Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . –0.3V to +V_IN

Output Current, Source or Sink . . . . . . . . . . . . . . . . . . . 500mA

Reference Output Current . . . . . . . . . . . . . . . . . . . . . . . . 50mA

Oscillator Charging Current . . . . . . . . . . . . . . . . . . . . . . . . 5mA

Power Dissipation at T_A= +25°C (Note 2). . . . . . . . . . 1000mW

Power Dissipation at T_C= +25°C (Note 2) . . . . . . . . . 2000mW

Operating Junction Temperature . . . . . . . . . . –55°C to +150°C

Storage Temperature Range . . . . . . . . . . . . . –65°C to +150°C

Lead Temperature (Soldering, 10 seconds) . . . . . . . . . +300°C

Note 1: Values beyond which damage may occur.

Input Voltage (+V_IN) . . . . . . . . . . . . . . . . . . . . . . . +8V to +35V

Collector Supply Voltage (V_C). . . . . . . . . . . . . . . +4.5V to +35V

Sink/Source Load Current (steady state) . . . . . . . . 0 to 100mA

Sink/Source Load Current (peak) . . . . . . . . . . . . . . 0 to 400mA

Reference Load Current . . . . . . . . . . . . . . . . . . . . . . 0 to 20mA

Oscillator Frequency Range. . . . . . . . . . . . . . 100Hz to 400kHz

Oscillator Timing Resistor . . . . . . . . . . . . . . . . . . 2kΩ to 150kΩ

Oscillator Timing Capacitor . . . . . . . . . . . . . . . .001µF to .01µF

Dead Time Resistor Range . . . . . . . . . . . . . . . . . . . . 0 to 500Ω

Operating Ambient Temperature Range

UC1525A, UC1527A . . . . . . . . . . . . . . . . . . –55°C to +125°C

UC2525A, UC2527A . . . . . . . . . . . . . . . . . . . –25°C to +85°C

UC3525A, UC3527A . . . . . . . . . . . . . . . . . . . . . 0°C to +70°C

Note 3: Range over which the device is functional and parame-

ter limits are guaranteed.

Note 2: Consult packaging Section of Databook for thermal

limitations and considerations of package.

CONNECTION DIAGRAMS

DIL-16 (TOP VIEW)

J or N Package

PLCC-20, LCC-20 (TOP VIEW)

Q, L Package

PACKAGE PIN FUNCTION

FUNCTION

N/C

Inv. Input

N.I. Input

SYNC

OSC. output

N/C

C_T

R_T

Discharge

Softstart

N/C

Compensation

Shutdown

Output A

Ground

N/C

V_C

Output B

+V_IN

V_REF

UC1525A/27A

UC2525A/27A

UC3525A/27A

ELECTRICAL CHARACTERISTICS:+V_IN= 20V, and over operating temperature, unless otherwise specified, T_A= T_J.

UC1525A/UC2525A

UC1527A/UC2527A

UC3525A

UC3527A

UNITS

PARAMETER

Reference Section

TEST CONDITIONS

MIN

TYP

MAX

MIN

TYP

MAX

Output Voltage

T_J= 25°C

_IN= 8 to 35V

5.05

5.10

5.15

5.00

5.10

5.20

Line Regulation

Load Regulation

I_L= 0 to 20mA

Temperature Stability (Note 5)

Total Output Variation (Note 5)

Shorter Circuit Current

Output Noise Voltage (Note 5)

Long Term Stability (Note 5)

Oscillator Section(Note 6)

Initial Accuracy (Notes 5 & 6)

Voltage Stability (Notes 5 & 6)

Temperature Stability (Note 5)

Minimum Frequency

Over Operating Range

Line, Load, and Temperature

5.00

5.20

100

200

4.95

5.25

100

_REF= 0, T_J= 25°C

10Hz ≤ 10kHz, T_J= 25°C

200 µVrms

T_J= 125°C

T_J= 25°C

± 2

± 0.3

± 3

± 6

± 1

± 6

120

± 2

± 1

± 3

± 6

± 2

± 6

120

V_IN= 8 to 35V

Over Operating Range

R_T= 200kΩ, C_T= 0.1µF

R_T= 2kΩ, C_T= 470pF

kHz

Maximum Frequency

400

1.7

3.0

0.3

1.2

400

1.7

3.0

0.3

1.2

Current Mirror

_RT= 2mA

2.0

3.5

0.5

2.0

1.0

2.2

2.0

3.5

0.5

2.0

1.0

2.2

Clock Amplitude (Notes 5 & 6)

Clock Width (Notes 5 & 6)

Sync Threshold

T_J= 25°C

1.0

2.8

2.5

1.0

2.8

2.5

µs

Sync Input Current

Sync Voltage = 3.5V

Error Amplifier Sectio(nV_CM= 5.1V)

Input Offset Voltage

0.5

µA

Input Bias Current

Input Offset Current

µA

DC Open Loop Gain

R_L≥ 10MΩ

Gain-Bandwidth Product

(Note 5)

A_V= 0dB, T_J= 25°C

MHz

DC Transconductance

(Notes 5 & 7)

T_J= 25°C, 30kΩ ≤ R_L≤ 1MΩ

1.1

1.5

1.1

1.5

Output Low Level

0.2

5.6

0.5

0.2

5.6

0.5

Output High Level

3.8

Common Mode Rejection

Supply Voltage Rejection

_CM= 1.5 to 5.2V

_IN= 8 to 35V

Note 5: These parameters, although ensured over the recommended operating conditions, are not 100% tested in production.

Note 6: Tested at f_OSC= 40kHz (R_T= 3.6kW, C_T= 0.01mF, R_D= 0W). Approximate oscillator frequency is defined by:

f =

C_T(0.7R_T+ 3R_D)

Note 7: DC transconductance (g_M) relates to DC open-loop voltage gain (A_V) according to the following equation: A_V= g_MR_L

where R_Lis the resistance from pin 9 to ground. The minimum g_Mspecification is used to calculate minimum A_Vwhen the

error amplifier output is loaded.

UC1525A/27A

UC2525A/27A

UC3525A/27A

ELECTRICAL CHARACTERISTICS:+V_IN= 20V, and over operating temperature, unless otherwise specified, T_A= T_J.

UC1525A/UC2525A

UC1527A/UC2527A

UC3525A

UC3527A

UNITS

PARAMETER

PWM Comparator

TEST CONDITIONS

MIN

TYP

MAX

MIN

TYP

MAX

Minimum Duty-Cycle

Maximum Duty-Cycle (Note 6)

Input Threshold (Note 6)

0.9

3.3

.05

0.9

3.3

.05

Zero Duty-Cycle

Maximum Duty-Cycle

0.7

3.6

1.0

3.6

1.0

Input Bias Current (Note 5)

Shutdown Section

µA

Soft Start Current

_SD= 0V, V_SS= 0V

_SD= 2.5V

0.4

0.8

0.4

0.2

0.7

1.0

0.5

0.4

0.8

0.4

0.2

0.7

1.0

0.5

µA

Soft Start Low Level

Shutdown Threshold

Shutdown Input Current

Shutdown Delay (Note 5)

To outputs, V_SS= 5.1V, T_J= 25°C

_SD= 2.5V

V_SD= 2.5V, T_J= 25°C

0.6

µs

Output Drivers(Each Output) (V_C= 20V)

Output Low Level

Output High Level

_SINK= 20mA

0.2

1.0

0.4

2.0

0.2

1.0

0.4

2.0

I_SINK= 100mA

_SOURCE= 20mA

_SOURCE= 100mA

Under-Voltage Lockout

V_COFF Current (Note 7)

Rise Time (Note 5)

_COMPand V_SS= High

V_C= 35V

200

600

300

200

600

300

µA

C_L= 1nF, T_J= 25°C

100

Fall Time (Note 5)

Total Standby Current

Supply Current

V_IN= 35V

Note 5: These parameters, although ensured over the recommended operating conditions, are not 100% tested in production.

Note 6: Tested at f_OSC= 40kHz (R_T= 3.6kW, C_T= 0.01mF, R_D= 0W)

Note 7: Collector off-state quiescent current measured at pin 13 with outputs low for UC1525A and high for UC1527A.

UC1525A/27A

UC2525A/27A

UC3525A/27A

PRINCIPLES OF OPERATION AND TYPICAL CHARACTERISTICS

UC1525A output circuit (1/2 circuit shown).

UC1525A output saturation characteristics.

For single-ended supplies, the driver outputs are

grounded. The V_Cterminal is switched to ground by the

totem-pole source transistors on alternate oscillator

cycles.

In conventional push-pull bipolar designs, forward base

drive is controlled by R1-R3. Rapid turn-off times for the

power devices are achieved with speed-up capacitors

C1 and C2.

The low source impedance of the output drivers provides

rapid charging of power FET Input capacitance while

minimizing external components.

Low power transformers can be driven by the UC1525A.

Automatic reset occurs during dead time, when both

ends of the primary winding are switched to ground.

UC1525A/27A

UC2525A/27A

UC3525A/27A

UC1525A oscillator schematic.

PRINCIPLES OF OPERATION AND TYPICAL CHARAC- turn-off signal to the outputs; and a 150µA-current sink

TERISTIC SHUTDOWN OPTIONS

(See Block Diagram)

begins to discharge the external soft-start capacitor. If the

shutdown command is short, the PWM signal is termi-

nated without significant discharge of the soft-start ca-

Since both the compensation and soft-start terminals

(Pins 9 and 8) have current source pull-ups, either can

readily accept a pull-down signal which only has to sink a

maximum of 100µA to turn off the outputs. This is subject

to the added requirement of discharging whatever exter-

nal capacitance may be attached to these pins.

pacitor, thus, allowing, for example,

a convenient

implementation of pulse-by-pulse current limiting. Holding

Pin 10 high for a longer duration, however, will ultimately

discharge this external capacitor, recycling slow turn-on

upon release.

Pin 10 should not be left floating as noise pickup could

conceivably interrupt normal operation. All transitions of

the voltage on pin 10 should be within the time frame of

one clock cycle and not repeated at a frequency higher

than 10 clock cycles.

An alternate approach is the use of the shutdown circuitry

of Pin 10 which has been improved to enhance the avail-

able shutdown options. Activating this circuit by applying

a positive signal on Pin 10 performs two functions; the

PWM latch is immediately set providing the fastest

Oscillator Charge Time vs R_Tand C_T.

Oscillator Discharge Time vs R_Dand C_T.

UC1525A/27A

UC2525A/27A

UC3525A/27A

R_Lis impedance from pin 9 to ground. Values below 30kΩ

will begin to limit the maximum duty cycle.

Maximum value R_Dvs minimum value R_T.

Error amplifier voltage gain and phase vs frequency.

Lab test fixture.

UC1525A/27A

UC2525A/27A

UC3525A/27A

REVISION HISTORY

REVISION

DATE

CHANGE

SLUS191B

6/28/05

Updated pin 10 description in the Principles of Operation and Typical

Characteristics Shutdown Options Section.

IMPORTANT NOTICE

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enhancements, improvements, and other changes to its products and services at any time and to discontinue

any product or service without notice. Customers should obtain the latest relevant information before placing

orders and should verify that such information is current and complete. All products are sold subject to TI’s terms

and conditions of sale supplied at the time of order acknowledgment.

TI warrants performance of its hardware products to the specifications applicable at the time of sale in

accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI

deems necessary to support this warranty. Except where mandated by government requirements, testing of all

parameters of each product is not necessarily performed.

TI assumes no liability for applications assistance or customer product design. Customers are responsible for

their products and applications using TI components. To minimize the risks associated with customer products

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UC3525ADWTR相关文章

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UC3525ADWTR产品参数

型号:	UC3525ADWTR
Brand Name：	Texas Instruments
是否无铅：	不含铅
是否Rohs认证：	符合
生命周期：	Active
零件包装代码：	SOIC
包装说明：	SOP, SOP16,.4
针数：	16
Reach Compliance Code：	compliant
ECCN代码：	EAR99
HTS代码：	8542.39.00.01
风险等级：	0.64
模拟集成电路 - 其他类型：	SWITCHING CONTROLLER
控制模式：	VOLTAGE-MODE
控制技术：	PULSE WIDTH MODULATION
最大输入电压：	35 V
最小输入电压：	8 V
标称输入电压：	20 V
JESD-30 代码：	R-PDSO-G16
JESD-609代码：	e4
长度：	10.3 mm
湿度敏感等级：	2
功能数量：	1
端子数量：	16
最高工作温度：	70 °C
最低工作温度：
最大输出电流：	0.5 A
最大输出电压：	5.2 V
最小输出电压：	5 V
标称输出电压：	5.1 V
封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP
封装等效代码：	SOP16,.4
封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE
峰值回流温度（摄氏度）：	260
认证状态：	Not Qualified
座面最大高度：	2.35 mm
子类别：	Switching Regulator or Controllers
表面贴装：	YES
切换器配置：	PUSH-PULL
最大切换频率：	400 kHz
技术：	BIPOLAR
温度等级：	COMMERCIAL
端子面层：	Nickel/Palladium/Gold (Ni/Pd/Au)
端子形式：	GULL WING
端子节距：	1.27 mm
端子位置：	DUAL
处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	7.5 mm
Base Number Matches：	1

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